What do these ranks mean? ORBIC's ranking definitions

Clouded Salamander

Clouded Salamander

Aneides ferreus

List 4S3S4
California Slender Salamander

California Slender Salamander

Batrachoseps attenuatus

List 4S3
Del Norte Salamander

Del Norte Salamander

Plethodon elongatus

List 4S3
Cope's Giant Salamander

Cope's Giant Salamander

Dicamptodon copei

List 2S2?
Southern Torrent Salamander

Southern Torrent Salamander

Rhyacotriton variegatus

List 4S3?
Columbia Torrent Salamander

Columbia Torrent Salamander

Rhyacotriton kezeri

List 2S2S3
Coastal Tailed Frog

Coastal Tailed Frog

Ascaphus truei

List 4S3
Johnson's Hairstreak

Johnson's Hairstreak

Callophrys johnsoni

List 2S2S3
Northern Red-Legged Frog

Northern Red-Legged Frog

Rana aurora

List 4S3S4
Foothill Yellow-Legged Frog

Foothill Yellow-Legged Frog

Rana boylii

List 2S2S3
Winged Floater

Winged Floater

Anodonta nuttalliana

List 3S2?
Oregon Floater

Oregon Floater

Anodonta oregonensis

List 2S3?

Horned Grebe

Podiceps auritus

List 2S2B,S5N

Red-Necked Grebe

Podiceps grisegena

List 2S1B,S4N
Western Ridged Mussel

Western Ridged Mussel

Gonidea angulata

List 1S2S3
Clark's Grebe

Clark's Grebe

Aechmophorus clarkii

List 4S3B,S2N
Fork-Tailed Storm-Petrel

Fork-Tailed Storm-Petrel

Hydrobates furcatus

List 2S2B
Western Pearlshell

Western Pearlshell

Margaritifera falcata

List 2S3
California Brown Pelican

California Brown Pelican

Pelecanus occidentalis californicus

List 2S2N
Pelagic Cormorant

Pelagic Cormorant

Urile pelagicus

List 4S3
Brant

Brant

Branta bernicla

List 4S2N
Aleutian Cackling Goose

Aleutian Cackling Goose

Branta hutchinsii leucopareia

List 2S3N
Dusky Canada Goose

Dusky Canada Goose

Branta canadensis occidentalis

List 2S3N
Bufflehead

Bufflehead

Bucephala albeola

List 2S2B,S5N
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